Shuttle-box tension-controlling mechanism for looms



c. H. DRAPER ET AL sn'u'r'rnm BOX TENSION commune macmmxsm FOR LOOMS Filed Dec. 5. 1924 1 provement in 40 mounted on the arms Patented Oct. 5, 1925.

UNITED STATES 1,556,207 PATENT OFFICE.

CLARE H. DEAPER AND JONAS NORTHROP, OF HOPEDALE, MASSACHUSETTS, AS-

SIGNOIRS TO IEIOIEDALE MANUFACTURING COMPANY, OF MILFORD, MASSACHU SETTS, A CORPORATION OF MASSACHUSETTS.

SHUTTLE-BOX TENSION-CONTROLLING MECHANISM FOR LOOMS.

Application filed December 3, 1924. Serial No. 753,611.

To all whom it may concern:

Be. it known that we, CLARE H. DRArnn and Jonas Nonrnnor, citizens of the United States, residing at Hopedale, in the county 5 of Worcester and Commonwealth of Massachusetts, have invented certain new and useful Improvements in Shuttle-Box Tension- Gontrolling Mechanism for Looms; and we do hereby declare the following to be a full,

clear, and exact description of the invention,

such as will enable'others skilled in the art to which it appertains to make and use the same.

The present invention relates to an imshuttle box tension controlling mechanism for looms. I

' The object of the invention is to reorganize'and improve shuttle box tension controlling mechanism for looms, and particularly for weft replenishing looms of the bobbin changing type. The invention consists in the loom hereinafter described and particularly defined in the claims. In the accompanying drawings illustrating the preferred form of the invention, Fig. 1 is a sectional elevation of the lay and associated parts; Fig. 2 is a detail showing one of the parts; and Figs. 3 and 4: illustrate a modified form of the invention hereinafter 0 referred to, inwhich Fig. 8 is a section on the line 3-3, Fig. 4c.

The illustrated embodiment of the invention is described as follows: The lay 10 is supported on the swords 11 provided with the shuttle box 12 adapted to contain a shuttle. The shuttle binder 14 is of the usual form, and is activated by the binder fingers 15 to cause pressure to be exerted upon the shuttle in the box. The shuttle fingers are 16 of the dagger shaft 17 mounted in the brackets on the lay in the usual manner. The dagger 18 is carried by the dagger shaft 17 and adapted to engage the steel 19 of the frog 20 in the usual manner. "An inertia arm 21 is secured to the dagger shaft 17, as shown in Fig. 2, and

carries the weight .22 secured to it. The hub 23 of the inertia arm is provided with a dagger stop 24 adapted to engage the plate 25 on the under side of the lay 10 for the purpose of preventing overthrow of the dagger as is usual.

.The right hand sigle of Fig. 1 is the front of the loom, and the lay is therefore shown at or near its back center position with no shuttle in the box. The movements of the lay backward and forward cause variations of pressure to be exerted upon the binders by the binder fingers owing to the weight 22 on the inertia arm. Thus, starting, from front center, as the lay moves rearwardly, rearward motion is imparted to'thejineijtia arm by the lay, and the inertia of the ii e ifght 22 causes it to take up the acceleratinggrearward movement of the lay more slowly than the lay, with the result that during the movement of the lay from front center to top center, the inertia arm relieves the pressure of the dagger fingers on the binders. So, therefore, the shuttle box tension decreases from front center td top ce ter. way of putting it w uld be li o say that the inertia arm accelerat s more slowly than the lay, and therefore tBIE ClS to reduce the pres sure of the binder mgers on the binders during the first part, of the rearward movement of the lay; This results in applying a diminished shpttle box tension before the picking point, which is reached a little before top center, so that the shuttle is held with less fricticn during picking. From top center to back lcenterlthe velocity of the lay in its backwar n oveinent is decreasing, and in consequence the inertia of'the inertia arm tends to increase theshuttle tension during this portion of the movement of the lay. At the back center the la Y comes to rest and the tension on the shuttle binders is greater than it was at the front center when it began to move rearwardly. 'pon passing the back center the velocity of the lay is accelerated in forward movemen and the inertia of the inertia arm, located as it is below the center of the dagger shaft, tends to cause the dagger fingers to bear upon the shuttle binders with a pressure decreasing as latter decreases. That is to say, the shuttle tension decreases from back center to bottom center. During this time the shuttle is received in the shuttle box. From bottom center to front center, inasmuch as the ve locity of the lay is decreasing, the weight tends to decrease the pressure of the dagger fingers on the shuttle binders, with the result,- that at the front center the pressure of th'shuttle binders on the shuttle is considerably less than when the lay began its rearward movement from front center.

A ther the velocity of thethe inertiaof Between the time when the lay comes to rest and when it starts rearwarcily sign the pressure on the binders increases. 1-; the back center between the time when the lay comes to resi. and it again starts forward, the pressure of the shuttle binders on the shuttle decreases.

It should be remarked that the precise variations in shuttle. tension clue to the use the iIESEuicZ arm for varying the shuttle tension are governed by large number oi elements and cannot be definecl with precise definitsness. When the direction of mot-ion oi? the lay changes, as at front center and book center, the act-ion of the weight erm on the binclers obviously changes. The

chance is robebl not rest at this Joint, but the prmerosl change in pressures en eri'zeoi by the bincler fingers on "the shuttle occurs nst beyond top center, and this contributes so secure the variations in the shut.- t ie bow; tensions which are desirable. Thus,

on bloc lay starts from back center forlbs crenl: shaft is moving forward slowly first and then more rapidly as the engulsricy of the crank increases, as a result of which the increased pressure oi the binders on the shuttle is greatest at first and decreases with increasing singularity so that the binder ressure reaches s miniiznum st the since it e lay reaches the end of its forweroi movement.

The arrangement secures a diminished shu s-ale tension at picking, an increased shuttie tension at boxing, and a relieved shuttle tension st or near tront center, and therefore during the time of bobbin transfer, which occurs, of course, slightly before front center. These variations in shuttle box tension contribute to the good operation of e loom, and iosrticularly s Weft replenishing loorn ottlie bobbin changing type.

in F i is shown a construction in which the bub 83 of the inertia arm 21 is loosely mounted on the dagger shaft 17, being held from enolwise movement in one direction by the collar 34-, and in the other olirection by the collar 35. The letter carries the dagger stop 24. Limited rotational movement of the hub 33 on the dagger shaft 17 is ermitted owing to the fact that the collar '35 curl the hub 33 are shouldered as shown as 36, ancl have s. spring 37 (see Fig. 3) between two cars 38 ancl 39 which are formecl on the collar 35 and hub 33 respectively...

Viewing the structure as shown in Fig. 1, and assumin it to be provided with the "form of inertie arm ancl support illustrated in Figs. 3 and 4', it Will be seen that when the lay moves forward the lag of the Weight 22 tends to compose the s ring 37, Whicb pressure is thereby exertec through, that spring upon the collar 35 of the Thus, the inertia of the Weight yielding applied in one erection to the dagger (bigger shaft. This secures a more gradual (100113280 of bile shuttle box tension during movement from back center to bottom mentor than during movement from front center to top center.

' Having thus described the invention, what is claimed is:

1. Shuttle box tension controlling mechanism for looms having, in combination, a lay, a shuttle box, a. binder, e. dagger shaft on the lay, bincler fingers on the dagger rod, and an inertia. arm on the dagger rorl pr violerl with a. Weight below the dagger rod.

2. Shuttle box tension controlling mechanism for looms having, in combination, a lay having a shuttle box, a binder for the shuttle box, inertia. controlled means for applying pressure to the binders acting to clecreese the binder pressure at. the picking point.

. Shuttle box tension controlling mechanism for looms havin in combination, lay having a. shuttle lib/S, a bincler for shuttle box, on inertia controlled tension applying means having; provision. for increasing the tension of the binder on the shuttle (luring boning.

4. Shuttle box tension controlling mechanism i'or Weft replenishing looms of the bobbin cl'ienging type having, combination, a lay provided with a. shuttle box, s. bincler for the shuttle box, anti en inertia controlled tension applying means acting to decrease the shuttle box tension at. front center to facilitate bobbin transfer.

5. Shuttle box tension controlling mechanism for looms bovin in combination, a lay provided with e s nttle box, binder for the shuttle box, inertia. controlled pressure applying means for the binders acting to decrease the binder pressure during oiclo ing and increase it during boxing.

6. Shuttle box tension controlling mechanism for weft replenishing looms of the bobbin changing type having, in combination, a

lay provided. with shuttle box, binders, and inertia. controlled pressure applying means acting to decrease the bincler pressure during picking and also to decrease it during bobbin transfer.

7. Shuttle box tension controlling iheolianisn for Weft replenishing looms or the bobbin chengin type having, in combination, zilay provicetl with e. shuttle box, binders I for the shuttle box, inert-is. controlled pres sure applying means acting to increase the binder pressure during boxing and to tie crease it luring t is time of bobbin transfer.

Shuttle box tension controlling mecl1anism for Weft replenishing looms of the bobbin changing type having, in combination, c lay PI'QVidQCl with a. shuttle box, a binder, inertia. controlled ressure applying means for the binders acting to increase the binder ores-sore from, fronbcenter to too center, to

increase it from top center to back; center, to decrease it from back center and to bottom center, to decrease it from bottom center to front center.

9. Shuttle box tension controlling mechanism for looms'having, in combination, a lay provided with shuttle boxes, binders for the boxes, a dagger shaft mounted on the lay, binder fingers carried by the dagger shaft and projecting upwardly therefrom to engage the binders, and aninertia arm mounted on the dagger shaft extending downwardly' therefrom and provided with a'weight.

, 10. Shuttle box tension controlling mechanism for looms having, in combination, a lay provided with shuttle boxes, binders for the shuttle boxes, inertia, controlled pressure applying means, for the binders having yieldmg means for transmitting increased pressure to thQ bIIIdQI'S, andpos1t1vemeansfor ers.

11. Shuttle box tension controlling mechanism for weft replenishing looms of the bobbin changing type having, in combination, a lay provided with a shuttle box, binders for transmitting decreased pressure to the bind the shuttle box, inertia controlled pressure applying means acting to apply pressure to the binders greatest in amount at the earliest i i 

